Threshold seal for a door astragal



FIG. 1 is a perspective view of a threshold seal for a door astragal showing my new design;

FIG. 2 is an end view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is the opposite end view thereof; and

FIG. 6 is a bottom view thereof. 

The ornamental design of a threshold seal for a door astragal, substantially as shown and described. 